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Published by Universitas Islam Negeri Syarif Hidayatullah Jakarta
ISSN : 24606065     EISSN : 25483013     DOI : 10.15408/jkv
Core Subject : Science,
Chemistry
Jurnal Kimia Valensi is a biannual and peer-reviewed open access journal published by Department of Chemistry, Faculty of Science and Technology UIN Syarif Hidayatullah Jakarta. This journal covering all aspect of chemistry.
Arjuna Subject : Umum - Umum
Articles 15 Documents
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Search results for , issue "Jurnal Kimia VALENSI Volume 5, No. 2, November 2019" : 15 Documents clear
Optimization of Pretreatment and Hydrothermal Process of Na-X Zeolite from Kaolin and Metakaolin Hartati Hartati; Satya Candra Wibawa Sakti; Putri Bintang Dea Firda; Chabibah Saidah
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1341.369 KB) | DOI: 10.15408/jkv.v5i2.11326

Abstract

Synthesis of Na-X zeolite was conducted from kaolin and metakaolin. Synthesis varied in its pretreatment method and hydrothermal conditions. The pretreatment methods used were: conventional alkaline, alkaline fusion and conventional fluoride. Hydrothermal conditions for the experiments were gradual temperature 40 oC  (6h), 60 oC (6h), 80 oC (12h), and constant temperature 80 oC for 24 h, 100 oC for 24 and 100 oC for 48 h. Synthesized products were characterized by X-Ray Diffraction (XRD), Fourier Transform InfraRed (FTIR), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), and N2 Isotherm Adsorption/Desorption method. The result showed that pre-treatment by conventional fluoride could not produce Na-X zeolite, synthesis by conventional alkaline and alkaline fusion with hydrothermal at 100 oC (48h), 100 oC (24 h), and gradual temperature produce Na-X zeolite with Na-P1 or Na-A zeolite as impurities, while synthesis from metakaolin by conventional alkaline with hydrothermal at 80 oC for 24 hours produced pure Na-X zeolite. Na-X zeolite and NaP1 zeolite with hierarchical pores were synthesized through alkali fusion with hydrothermal at 100 oC for 24 hours.  
Synthesis and Characterization of Calcium Oxide Nanoparticles from Duck Eggshells using Ball Milling Methods Ade Yeti Nuryantini; Citra Deliana Dewi Sundari; Halimahtussa’diah Halimahtussa’diah; Bebeh Wahid Nuryadin
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (955.108 KB) | DOI: 10.15408/jkv.v5i2.8779

Abstract

Calcium oxide (CaO) nanoparticles have been successfully synthesized from duck eggshells using ball milling method followed by simple calcination at 700°C for 7 hours. The observation on the morphology, size and shape of the particles of the eggshells powder was conducted through scanning electron microscope (SEM). The milling time was varied, i.e. 2, 6, 10, and 20 hours to observe the difference on the size of the produced particle. SEM images shows that the smallest average particle diameter was 520 nm, achieved by 20 hours of milling. When the particles were calcined, the average diameter was further reduced to 394 nm. The X-ray diffraction (XRD) analysis shows that the resulting particles contain calcium oxide, calcium hydroxide, and calcium carbonate. 
Preparation and Characterization of Chitosan Membranes from Crab Shells (Scylla olivacea) for Beverage Preservative Reni Mulyani; Dikdik Mulyadi; Nopriana Yusuf
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (734.623 KB) | DOI: 10.15408/jkv.v5i2.10637

Abstract

Chitosan can extend the shelf life of food and can be used in food preservation. Chitosan is derived from the shell of the animal crustacean, and is a derivative of the chitin polymer. This study aimed to determine the effectiveness of the use of chitosan membrane as an antibacterial compound and its application in pineapple juice products. Chitosan isolation is carried out through three stages, namely deproteination, demineralization, and deacetylation. Determination of the degree of deacetylation using the infrared spectroscopy method and the preservative effectiveness test was carried out based on SNI 01-2332.3-2006 concerning the testing of the Total Plate Count (ALT). Crab chitosan obtained from white-brown isolation results, soluble in 1% acetic acid and the value of the degree of deacetylation (DD) of chitosan crab is 81%. The addition of 1.5% crab chitosan membrane to pineapple juice can reduce bacterial growth until the 20th day with a total plate value (ALT) of 9.1x103 CFU / ml.
Preparation and Characterization of Composite Cellulose Acetate/NaA Zeolite/Alumina Membrane and Its Application in Vetiver Oil’s Pervaporation Asep Hadian Hadinata; Engela Evy Ernawati; Agnes Rezky Siahaan
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.031 KB) | DOI: 10.15408/jkv.v5i2.11698

Abstract

Rice husk is an agricultural waste that contains cellulose. Risce husk’s cellulose can be converted to cellulose acetate. Cellulose acetate (CA) is widely used as membrane’s material for pervaporation. This material has high swelling degree that can influence its performance. The membrane’s performance can be improved by addition of minerals such zeolite and alumina. The purpose of this study was to determine the characteristics and the best composition of CA/NaA zeolite/alumina composite membrane (CA/Na/Al) for pervaporation of Vetiver oil. Methods that has been done were acetylation of rice husk’s cellulose, synthesis of composite membrane, characterization, and pervaporation of Vetiver oil. Focused characteristics of membrane were its swelling degree, mechanical strength, and its morphology. Composite CA/Na/Al membrane has lower swelling degree than CA/NaA membrane because the existence of alumina that fill CA matrix. The optimum mechanical strength was gained by adding 2% alumina to membrane. But, composite CA/Na/Al 3% membrane was the best composition due to its performance. Membrane performance including its flux and the percentage of vetiverol gained (Cp), with flux value 367.83 g.m-2.h-1 and Cp value 15.584%.
Antibacterial Diterpenoid Against Pathogenic Oral Bacteria of Streptococcus Mutans ATCC 25175 Isolated From Sarang Semut (Myrmecodia Pendans) Mieke H Satari; Boima Situmeang; Indah Permata Yudha; Dikdik Kurnia
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 5, No. 2, November 2019
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (61.465 KB) | DOI: 10.15408/jkv.v5i2.8864

Abstract

Discovery of new antibacterial agent to treat oral disease caused by pathogenic oral bacteria is an attracted focus to more pay attention of researcher. The tropical natural product is the promising sources of new bioactive as antibacterial compounds. The epiphyte plant of Sarang Semut (M. pendans) empirically has been used as a drug to treat various diseases. Our previous research found that ethyl acetate extract of Sarang Semut inhibited the bacteria growth of Enterococcus faecalis. This study aims to isolate, structure determination and antibacterial activity evaluation of active compound against Streptococcus mutans ATCC 25175. The isolation by combination chromatography on normal and reverse phase resulted an antibacterial compound 1. Based on the analysis of the spectroscopic data including IR, FTIR, 1H-NMR, 13C-NMR, 2D-NMR as well as by mass spectroscopic (MS) and compare to reported data, structure of compound 1 was suggested as terpenoid type diterpene derivative. Antibacterial activity evaluation by Kirby-Bauer method of compound 1 against S. mutans ATCC 25175 showed inhibition zone values were 17.8, 14.5 and 11.1 mm at 10000, 5000 and 1000 ppm, respectively, while the MIC and MBC values were 18.125 ppm with MBC of 2500 ppm, respectively.

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